dolphin/Externals/WIL/include/wil/wrl.h
2020-02-09 19:01:44 +01:00

85 lines
3.6 KiB
C++

//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT.
//
//*********************************************************
#ifndef __WIL_WRL_INCLUDED
#define __WIL_WRL_INCLUDED
#include <wrl.h>
#include "result.h"
#include "common.h" // wistd type_traits helpers
namespace wil
{
#ifdef WIL_ENABLE_EXCEPTIONS
#pragma region Object construction helpers that throw exceptions
/** Used to construct a RuntimeClass based object that uses 2 phase construction.
Construct a RuntimeClass based object that uses 2 phase construction (by implementing
RuntimeClassInitialize() and returning error codes for failures.
~~~~
// SomeClass uses 2 phase initialization by implementing RuntimeClassInitialize()
auto someClass = MakeAndInitializeOrThrow<SomeClass>(L"input", true);
~~~~ */
template <typename T, typename... TArgs>
Microsoft::WRL::ComPtr<T> MakeAndInitializeOrThrow(TArgs&&... args)
{
Microsoft::WRL::ComPtr<T> obj;
THROW_IF_FAILED(Microsoft::WRL::MakeAndInitialize<T>(&obj, Microsoft::WRL::Details::Forward<TArgs>(args)...));
return obj;
}
/** Used to construct an RuntimeClass based object that uses exceptions in its constructor (and does
not require 2 phase construction).
~~~~
// SomeClass uses exceptions for error handling in its constructor.
auto someClass = MakeOrThrow<SomeClass>(L"input", true);
~~~~ */
template <typename T, typename... TArgs>
Microsoft::WRL::ComPtr<T> MakeOrThrow(TArgs&&... args)
{
// This is how you can detect the presence of RuntimeClassInitialize() and find dangerous use.
// Unfortunately this produces false positives as all RuntimeClass derived classes have
// a RuntimeClassInitialize() method from their base class.
// static_assert(!std::is_member_function_pointer<decltype(&T::RuntimeClassInitialize)>::value,
// "class has a RuntimeClassInitialize member, use MakeAndInitializeOrThrow instead");
auto obj = Microsoft::WRL::Make<T>(Microsoft::WRL::Details::Forward<TArgs>(args)...);
THROW_IF_NULL_ALLOC(obj.Get());
return obj;
}
#pragma endregion
#endif // WIL_ENABLE_EXCEPTIONS
/** By default WRL Callback objects are not agile, use this to make an agile one. Replace use of Callback<> with MakeAgileCallback<>.
Will return null on failure, translate that into E_OUTOFMEMORY using XXX_IF_NULL_ALLOC()
from wil\result.h to test the result. */
template<typename TDelegateInterface, typename ...Args>
::Microsoft::WRL::ComPtr<TDelegateInterface> MakeAgileCallbackNoThrow(Args&&... args) WI_NOEXCEPT
{
using namespace Microsoft::WRL;
return Callback<Implements<RuntimeClassFlags<ClassicCom>, TDelegateInterface, FtmBase>>(wistd::forward<Args>(args)...);
}
#ifdef WIL_ENABLE_EXCEPTIONS
template<typename TDelegateInterface, typename ...Args>
::Microsoft::WRL::ComPtr<TDelegateInterface> MakeAgileCallback(Args&&... args)
{
auto result = MakeAgileCallbackNoThrow<TDelegateInterface, Args...>(wistd::forward<Args>(args)...);
THROW_IF_NULL_ALLOC(result);
return result;
}
#endif // WIL_ENABLE_EXCEPTIONS
} // namespace wil
#endif // __WIL_WRL_INCLUDED